1. "They're so big, some of them, they have to have these supports. To hold them up, so to speak. These supports are called buttresses. They remind me of viaducts, for some reason."
2. I know that buttresses are supports for buildings, like the cathedral Robert is attempting to describe to the blind man. My guess is that a viaduct is also some form of support for a building or structure.
3. Definition: A long elevated roadway usually consisting of a series of short spans supported on arches, piers, or columns. (Merriam Webster Dictionary)
4. Buttresses remind Robert of viaducts because they're used to support roadways overpassing a river, lake, valley, etc.
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